Study on the detection method of holes in composite insulator rods

Zhang, Sida; Cheng, Li; Liu, Yunfan; Liao, Ruijin; Wang, Tingting; Huang, Huan

doi:10.1049/hve2.12083

Cited by 10 publications

(7 citation statements)

References 24 publications

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“…The dye penetrant method relies on the capillary action of the test solution to determine whether the sheath of the core rod and the fiber resin inside the core rods have defects throughout the upper and lower parts of the interface [20]. The prepared samples of basalt fiber composite cross arms and glass fiber composite cross arms were tested, and the results are shown in Figure 7.…”

Section: Interface Propertiesmentioning

confidence: 99%

Properties of Basalt Fiber Core Rods and Their Application in Composite Cross Arms of a Power Distribution Network

et al. 2022

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As basalt fiber has better mechanical properties and stability than glass fiber, cross arms made of continuous basalt-fiber-reinforced epoxy matrix composites are capable of meeting the mechanical requirements in the event of typhoons and broken lines in coastal areas, mountainous areas and other special areas. In this paper, continuous basalt-fiber-reinforced epoxy matrix composites were used to fabricate the core rods and composite cross arms. The results verified that basalt fiber composite cross arms can meet the strict requirements of transmission lines in terms of quality and reliability. In addition to high electrical insulation performance, the flexural modulus and the flexural strength of basalt fiber core rods are 1.8 and 1.06 times those of glass fiber core rods, respectively. Basalt fiber core rods were found to be much better load-bearing components compared to glass fiber core rods. However, the leakage current and the result of scanning electron microscopy (SEM) analysis reveal that the interface bonding strength between basalt fibers and the matrix resin is weak. A 3D reconstruction of micro-CT indicates that the volume of pores inside basalt fiber core rods accounts for 0.0048% of the total volume, which is greater than the 0.0042% of glass fiber rods. Therefore, improving the interface bond between basalt fibers and the resin can further improve the properties of basalt fiber core rods.

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Section: Interface Propertiesmentioning

confidence: 99%

Properties of Basalt Fiber Core Rods and Their Application in Composite Cross Arms of a Power Distribution Network

et al. 2022

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“…These tiny defects will continue to grow under the influence of various factors and will eventually lead to the failure of the cable material. Production process defects are inevitable (Zhang et al, 2021), power equipment's service life is influenced by production quality, which requires tight management.…”

Section: Frontiers In Materialsmentioning

confidence: 99%

A review of non-destructive methods for the detection tiny defects within organic insulating materials

et al. 2022

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In recent years, solid organic materials such as silicone rubber and epoxy resin have been widely used in electrical equipment due to their excellent insulation properties. However, as a result of manufacturing and design flaws as well as aging issues during operation, the insulating materials in the linked state no longer fit tightly and tiny structural defects (defect size less than 10 mm) develop, such as debonding at the composite interface, pores or cracks within the insulating material, etc. Tiny defects are prone to partial discharges and breakdowns, compromising the safety of high-voltage power equipment, particularly when subjected to strong electric fields. Therefore, it is necessary to carry out non-destructive testing (NDT) for such tiny defects. Such defects are small in size, easily buried in the material, and even some are wrapped in metal, which in turn requires very high detection accuracy, but traditional methods are difficult to achieve, so NDT technologies for tiny defects within insulating materials have become a research hotspot in the field of electric power in recent years. This paper firstly introduces the sources of tiny defects in solid organic insulating materials for electrical equipment. Secondly, the harm caused by structural defects is elaborated. Finally, emerging NDT methods and their advantages and limitations in defect detection are described in detail. The review aims to provide the reader with a comprehensive overview of most of the NDT techniques used in the detection of tiny defects within solid organic insulating materials for electrical equipment and their most salient features.

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“…For instance, over 10 million strings of composite insulators have already been used at the different levels of high-voltage transmission lines in China [ 7 ]. A composite insulator mainly consists of three components [ 8 , 9 , 10 ]. The metal end fittings at both ends of the insulator are for sealing and fixing.…”

Section: Introductionmentioning

confidence: 99%

Influence of Surface Discharge on Resin Degradation in Decay-like Fracture of Composite Insulators

Wang

Bao²,

Gao³

et al. 2023

Polymers

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Composite insulators have gradually become the preferred approach for electrical insulation in power systems, especially in polluted areas. Composite insulators consist of three main components: the shed, rod, and end fitting. Insulators withstand mechanical stresses via rods that are composed of glass-fiber-reinforced epoxy (GFRE). However, regardless of the high tensile strength of GFRE rods, in real-life operation, abnormal fractures have frequently been reported all over the world, which substantially increase the risk of major accidents in power systems. Fractural accidents mainly consist of brittle and decay-like fractures, which exhibit rather different morphologies at the cross sections. Brittle fracture has been effectively eliminated, while the mechanism of decay-like fracture has still not been clearly revealed. In this study, surface discharge tests were applied to investigate the discharge influence on the degradation of GFRE. The test successfully simulated the composition variation of the rods in real-life composite insulators with decay-like fractures. Moreover, it confirmed that the distinction between the characteristics of brittle fracture and decay-like fracture stems from epoxy degradation due to hydrolysis and carbonization. In addition, the respective influences of the resin type, glass fiber type, and acid liquid immersion on the degradation process were probed, and the degradation mechanism proposed in this research was verified. Based on the results, measures for preventing the development of decay-like fractures in real-life operations were determined.

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Study on the detection method of holes in composite insulator rods

Cited by 10 publications

References 24 publications

Properties of Basalt Fiber Core Rods and Their Application in Composite Cross Arms of a Power Distribution Network

Properties of Basalt Fiber Core Rods and Their Application in Composite Cross Arms of a Power Distribution Network

A review of non-destructive methods for the detection tiny defects within organic insulating materials

Influence of Surface Discharge on Resin Degradation in Decay-like Fracture of Composite Insulators

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